81224381451 has 8 divisors (see below), whose sum is σ = 108300787200. Its totient is φ = 54148781672.

The previous prime is 81224381423. The next prime is 81224381453. The reversal of 81224381451 is 15418342218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81224381451 - 2¹⁴ = 81224365067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81224381453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96706 + ... + 414488.

It is an arithmetic number, because the mean of its divisors is an integer number (13537598400).

Almost surely, 2^81224381451 is an apocalyptic number.

81224381451 is a deficient number, since it is larger than the sum of its proper divisors (27076405749).

81224381451 is a wasteful number, since it uses less digits than its factorization.

81224381451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402985.

The product of its digits is 61440, while the sum is 39.

The spelling of 81224381451 in words is "eighty-one billion, two hundred twenty-four million, three hundred eighty-one thousand, four hundred fifty-one".